I know many here are thrilled with hunting game on high fenced properties in South Africa. But, this is a classic example of the difference between hunting a game animal behind a fence rather than in his natural environment. Had the same 5 days been spent in Mozambique, the PH would have been doing everything in his power to find the best waterbuck among the many free range bulls you were seeing rather than chasing around a single immature animal.
I am not surprised the PH backed you up on a wounded giraffe. Though I am rather surprised he was carrying a rifle on a PG hunt.
I have never had the interaction you describe with any PH with which I have hunted. Though, I admit that I am confident that I haven't hunted with this particular one.